import java.util.ArrayList;

class GameBoard {
	int								  width, height;
	ArrayList<ArrayList<Character>>   board;
	
	GameBoard(int w, int h) { 
    	this.width = w; 
    	this.height = h;
    	this.board = new ArrayList<ArrayList<Character>>();
		for (int r=0; r<height; r++) {
		    ArrayList<Character>  aRow = new ArrayList<Character>();   // Make a new row
		    for (int c=0; c<width; c++)                                // Add spaces to the row
		        aRow.add(' ');
		    this.board.add(aRow);                                      // Add the row to the grid
		}
    }
    
    //This method prints out the board
    void display(ArrayList<GameObject> objects) {
    	// Erase the stuff at the old player and ball locations
    	for(GameObject obj: objects) {
    		if (obj instanceof MovableObject) {
    			MovableObject m = (MovableObject)obj;
    			if ((m.previousLocation.y >= 0) && (m.previousLocation.y < height) && (m.previousLocation.x >= 0) && (m.previousLocation.x < width))
    				this.board.get(m.previousLocation.y).set(m.previousLocation.x, ' ');
    		}
    	}
    	
    	// Draw the game objects on the board now
    	for(GameObject obj: objects) {
    		if (obj instanceof Wall) {
    			Wall w = (Wall)obj;
    			for (int i=0; i<w.width; i++) 
    				this.board.get(w.location.y).set(w.location.x+i, w.getAppearance());
    			for (int i=0; i<w.height; i++) 
    				this.board.get(w.location.y+i).set(w.location.x, w.getAppearance());
    		}
    		else {
    			if ((obj.location.y >= 0) && (obj.location.y < height) && (obj.location.x >= 0) && (obj.location.x < width))
    				this.board.get(obj.location.y).set(obj.location.x, obj.getAppearance());
    		}
    	}
    	
    	// Now display it
        for (int r=0; r<height; r++) {
        	ArrayList<Character> aRow = this.board.get(r);
            for (int c=0; c<width; c++) {
                System.out.print(aRow.get(c));
            }
            System.out.println();
        }
    }
}